[in]
1
3 10 2 9
12
[out]
5
Skip position 1 10 then calculate others as total (3 + 2 + 9 = 14). Split total with 2 (two persons) (14 / 2 = 7). Then 12 as bill, minus with 7 (12 - 7 = 5) result become 5.
[in]
1
3 10 2 9
7
[out]
Bon Appetit
When result is 0 then print Bon Appetit.